ROCKFORD (WIFR) -- Russell Jefferson is wanted for murder. Jefferson's 25 years old. He's 5'6", 195 lbs., with black hair and brown eyes. Donald Harvey is wanted for aggravated battery. Harvey's 49. He's 5'10", 215 lbs., with black hair and brown eyes. Legion Charlton is wanted for a probation violation. Charlton's 25. He's 5'9", 175 lbs., with black hair and brown eyes. And Antwon Chambers is wanted for criminal sexual assault. Chambers is 20 years old. he'd 5'11", 180 lbs., with black hair and brown eyes. If you know the whereabouts of any of these four, make the anonymous call to Crime Stoppers andyou could earn a cash reward of up to $1,000.